fix: vector as label

README.md

@@ -15,7 +15,7 @@ Before us, there have been many tutorials and add-ons for importing volumetric d
 
 Below are some examples with Bioxel Nodes. Thanks to Cycles Render, the volumetric data can be rendered with great detail:
 
-![gallery](assets/gallery.png)
+![gallery](docs/assets/gallery.png)
 
 The "Bioxel" in "BioxelNodes", is a combination of the words "Bio-" and "Voxel". Bioxel is a voxel that stores biological data. The volumetric data made up of Bioxel is called Bioxels. We are developing a toolkit around Bioxels for better biological data visualization. but before its release, we made this Blender version of bioxels toolkit first, in order to let more people to have fun with volumetric data. [Getting Started](https://omoolab.github.io/BioxelNodes/latest/getting-started)
 

bioxelnodes/io.py

@@ -139,6 +139,8 @@ def rgb2gray(image):
 
     return sitk.Cast(I, sitk.sitkFloat32)
 
+def x2gray(image):
+    return sitk.VectorIndexSelectionCast(image, 0, sitk.sitkUInt16)
 
 class ImportVolumeDataDialog(bpy.types.Operator):
     bl_idname = "bioxelnodes.import_volume_data_dialog"
@@ -225,7 +227,11 @@ class ImportVolumeDataDialog(bpy.types.Operator):
             bioxel_size, image_shape, orig_spacing)
 
         if self.read_as == "labels":
-            image = sitk.Cast(image, sitk.sitkUInt16)
+            if "vector" in image.GetPixelIDTypeAsString():
+                print("Convet to Grayscale...")
+                image = x2gray(image)
+            else:
+                image = sitk.Cast(image, sitk.sitkUInt16)
             default_value = 0
         elif self.read_as == "scalar":
             if "vector" in image.GetPixelIDTypeAsString():